It seems to be internal resorption which generally occurs after trauma might be the cause of color change , get an iopa done, because trauma even can cause traumatic cyst, which gets infected and leads to pain, bleeding and exudation. Depending on that treatment should be planned.
It's something like a phoenix infection meaning restarted and colour change is due to blood clot .get an X-ray done to figure out if periapical abcess then get rct followed by crown and later apisectomy if required
Go for xray of your tooth then only treatment can be planned
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